Electric-motor mechanism for operating elevator-safeties.



APPLICATION FILED MAY 19. 10ML Patented Out. 8, 19312.

UNTED STATES PATENT OFFICE.

AXEL MAGNUSON, OE NEW YORK, N.Y., 'AssIGNoR To o'rIs ELEVATOR COMPANY,OE JERSEY CITY, NEW JERSEY, A CORPORATION OE NEW JERSEY.

ELECTRIC-MOTOR MEGHANISM To all whom t may concern:

Be it known that I, AXEL MAGNUSON, a

Specification of Letters Patent.

a Application led May 19, 1908. Serial No. 433,780.

FOR OPERATING ELEVATOR-SAFETIES.

Patented Oct. 8, 1912.1

ported by a frame B comprising sides a and 'secured to the under surfaceof the ear citizen of the United States, residing in the, ioor, and abottom c. Pairs of gripping l city of New York, in the county of NewYork and State of New York, have invented a new and useful Improvementin Electric- Motor Mechanism for Operating Elevator- Safeties, of whichthe :following is a speciication.

My invention relates to emergency brakes for elevator cars, and isadapted for use with that type of brake in which gripping jaws carriedby the elevator car are adated to 'grip the vertical guide rails in thee evator shaft.

One of the objects of the present invention is to provide an electricmotor for operating the brake-applying mechanism.

Another object of the invention is the provision of a manual device incombination with the motor for either applying or releasing the brakes.

Another feature of the invention resides in the means for.controllingthe brake-Open ating motor.

Othei` objects of the invention will appear hereinafter, the novelcombination of elements being set forth in the appended claims.

Referring to the accompanying drawings, Figure 1 is a general Viewshowing guide brake mechanism for an elevator, and also showingdiagrammatically the electric system of control for the hoisting motor.and brake-,operating motor; Fig. 2 is a fragmentary view of amodilication in which the brake motor is placed on top of the elevatorcar; Fig. 3 `is a diagrammatic View of an ,elevator system to which myinvention may floor of the car, and, as here shown, 1s supjaws 4, 5 and4', 5 are pivoted at 6 and 6 respectively, and are adapted to lgrip thestationary vertical guide rails 8, 8 The jaws are operated by cams 9 and9 on the outer ends of short rods 10 and 10. Between these rods and inline therewith are two other rods 11, 11 mounted in bearings 12, 12 andhaving their inner ends provided with right and left-hand screw threads,respectively, to receive the correspondingly threaded safety drum 13.The adjacent ends of the rods l0, 11 and 10', l1 have right andleft-hand threads to receive the inter nally threaded pinions 14 and 14Cin mesh with rack bars 15 ,and 15. Between the rack bars is a smallelectric motor N comprising a magnet frame 16 secured to the frame'B andan armature 17 -mounted in bearings 18, 18. The armature shaft 20 isextended some distance beyond each end of the armature and has bearingsin brackets 2l4 secured to the frame B. Keyed to the shaft 2O arepinions 22 and 22 meshing with the rack bars, and a sprocket wheel 24connected by a sprocket chain 25 to a pinion 26 adapted to be operatedby a hand wheel 27 located in any convenient position in the car. Thesafety drum 13 is operated by the mechanism shown in Fig. fl. A governor35, of any suitable form, is located at the top of the elevator well..Around the sheave 36 of the governor passes an endless rope 87 which ishcld taut by means of the weight. 38 and sheave 39 at the bottom of thewell. The governor rope has the usual yielding connection with the lcar(l at 40, and passes over the directing pulleysl Lt1 and ft2 mounterl onthe lower portion of the car, and thence to the safety drum 13 aroundwhich it is wound. l

The operation is as follows: Normally the govdrnor rope travels with thecar and rotates the sheavesl at the top and bottoni of the well and alsothe centrifugal governor mechanism. llf'hcn the car speed exceeds apredetermined limit, the governor operates the gripping dcvice li3 tohold the governor rope stationary.l As the car continues to vlongitudinally and carry with tion l havel herein shown-a well knownsysconductor 29 Vsition with the motor at rest.

troller lever 57 in the car be. moved to the llett to bridge thecontacts 58 and 59, a circuit will be established as ollows,-rom

. switch contacts 45,

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move, lthe governor rope will be discon-l nected from the car at 40 andthe 'relative movement ofthe rope and carwill rotate the safety drum 13.drum 13 begins substantially at the same time the governor rope isgripped, and the rods 11 and 11 which are held against rotationimmediately commence to move out them the pinions 14, 14', the rods 10,10 and the cams 9, 9, the latter operating to apply the grip- ,ping jawsto the guide rails.

The present invention is especially adapted Yfor use with electricallyoperated and controlled elevators, and by way of illustratem -ofelectrical control in connection with 'my invention. rlhis systemcomprises a motor armature A, a shunt field winding S, reversingswitches R, R', a potential 'switch l?, and a controller switch E in theelevator car. The positive and negative mains designated andrespectively, are connected toany suitable source of current supply.Current from these mains is l supplied through the main line switch L,conductors 28 and 29, and potential switch P to the various motorcontrolling and operating circuits. The circuitthrough the potentialswitch magnet is asy tollows,-from the positive main' through the switchL, conductor 28, contacts 45. and 47, vwinding 49 of the potentialswitchmagnet, conductor 50, Asafety switch 51 in the car, conductor 53,switch 54, conductors 55 and 56, contacts 48 and 46, and switch L to thenega-tive main. This circuit is normally closed and receives current tohold the potential'switch closed so that current may be Vsupplied to themotor lvl. and controlling circuits.

' The parts are shown in their normal polf the conthrough the potentialthe positive main 47, conductor 60, magnet Winding 61, conductor 62,Contact 58, switch `versing 59, conductor 56, and to the negative main.The reversing switch R will now operate to close a circuit to the motorarmature as follows,--from the positive main through the potentialswitch, conductors 60, 63,'reversing switch contacts 64, brush 65,armature-windings, lorush 6,6, reswitch contacts 67, and to the negativemain. A circuit will also be established through the shunt field windingS' which may be 4traced through the conductor 60, reversing switchcontacts 68, 69, 70, conductors 71, 72,1ield winding S, and conductor73. rlhe motor armature and .field winding now receive clilrrent and themotor is operated to lift the car.. A reversal of the controller lever57, Contact The motionvof the -switch opens the main motor meeste lever57 effects a reversal of the motor in the well known manner. i

The circuit for. the brake motor N is controlled by the potential switchP and isopen at the contacts 30, 3l while the potential.

switch is closed. When the'potential switch magnet drops itsarmature, acircuit to the motor N is closed as follows,-,-rom the positive mainthrough conductor 28, contacts 45, 30, conductor 32 to the motor,through the shunt field .and armature windings of the motor, conductor`33, switch 34, conductor 52, contacts 31, 46, and thence to the negaltive main. A pilot la1np 77 is connected between the conductors 32 and52 and serves to indicate when the potential switch is open.

Whenever the potential switch magnet solenoid releases its plunger,either on ac. count of ther'main line potential falling be-A low apredetermined value or the magnet circuit beingv interrupted at'anypoint, the

current supply will be cut oft from the hoist- 'mg motor M, and theusual yelectro-magnetic brake for said motor will be applied to bringthe motor and car to rest. As the potential circuits, it also closes thecircuit for the motor N which immediately commences to-rotate itsarmature and apply the emergency brakes. The

movement of the armature is transmitted through the pinions 22 and 22and rack bars to the'pinions 14 and 14. The rotation ofthe pinions-14and 14 on the'rods 11 and .11 .moves said .pinions and the rods 10 and10 outwardly, and the rotation of the pinions on the rods 10 and l0gives said rods an additional movement toward the gripping jaws. movedoutwardly and operate the gripping jaws in an obvious manner.

1lt will be noted that the conditions for supplying current to themotors M and N are such that the'current supply to the hoist- The cams 9and 9 are thusing motorv is always cutl off while the brake i' motor-Nis receiving current; that is, the potential switch always keeps thecurrent supply out olf from at least one of the motors.

V The emergency brake may be applied by the operator in the carat anytime by opening .the safetyswitch 51 ink the potential switch magnetcircuit.- Any of the usual automatic safety switches may -be placed inthis circuit, as, for example, the stop limit switches that areautomatically opened when the car nea-rs its limits of travel, the slackcable switch, or the speedl governor switch.

A switch lever 7 5 is'connected at one end to the cam 9 and holds theswitch'54 closed while the cam is A-in its innerpositionand the grippingjaws released. When the cam is moved outwardly, however, to operate thegripping jaws, the switch 54 is opened to open the potential switchmagnet circuit.

When the safety drum 13 is rotated auto-i niatically by the governor toapply the emergency brakes it will not only do so by a direct operationof the cams 9 and 9', but thc initial movement of the cam 9 will openther switch 54 and effect the operation of the motor N which willincrease the power and speed with which the cams are operated, while atthe same time cutting ott' the current supply from the hoisting motor.

rlhc hand wheel 27 forms a convenient' means tor releasing the grippingjaws and bringing the rack bars back to initial position after the motorN has operated. 'It ma also be used either to relieve the brakes suticicntly to permit the car to gradually slide down to a floor landingor any desired position after the brakes have been operated, or totighten the gripping jaws and hold the car more firmly.

In the arrangement shown in Fig. 2 the motor N is placed on top of theelevator car instead oi. being placed under the car with its armaturemounted on the shaft 20. A

' sprocket chain 80 connects the sprocket wheels Sl and 82securedlrespcctively to the motor .shaft and t0 the Shaft 0f the handwheel QT. The operation is the same as that ot the arrangement shown inFig. l, the power from the motor in this instance being transmittedthrough the chains 8O and 25,19

' the shaft 20.

Various changes in the details of construe-I tion and arrangement ofparts Iriight be made without departing from the spirit and" scope otthe invention, and I wish therefore not to be limited to the preciseconstruction herein disclosed.

What l. claim as new and desire to have protected by Letters Patent ofthe United States is i.. In an elevator, the combination of im elevatorcar, ay car brake comprising brake members carriedby the car andcooperating stationary brake members, a rotary electric motor carried bythe car, and positively driven operating connections between the motorand the said first-named members.

ln brake mechanism, the combination with gripping jaws, of ascrew-threaded rod, a cam carried by the rod; a pinion mounted on therod, an electric motor, and gearing between the niotor and said pinion.

3. Inbrake'mechanism, the combination with gripping jaws, of a rotaryeleetricmotor, a rack and pinion operated by the motor lo apply thebrake, and mechanism between the rackand pinion and the gripping jawst'or operating the latter.

l. The combination with a gripping device, of a rack bar,power-transm1tting means between said parts, and an electric motor 'foroperating the rack bar to apply the gripping device. i

5. The combination withal4 brake, of an automatically.operable devicefo'r operating the brake, a second device for effecting, an additionaloperationof the brakeano an electric motor for operating said seconddevice.

G. The combination with a brake, of an automatic device for operatingthe brake, mechanism for effecting an additional operation of the brake,an electric motor for operating said mechanism, and means operated bysaid device for controlling the supply o current to the motor.

7. The combination with a brake, of successively operative brakeapplying devices, one of which is automatically operable independent ofthe other, a rotary electric motor for operating one of said devices,and a switch operated by the other of said devices and `controlling thesupply of current to the motor.

8. In an elevator, the combination with a car, of a car brake, a safetydrum, operating means therefor, operating connections .between thesafety drum and brake, additional brake-'operating mechanism, anelectric Inotor for operating said mechanism, and means operated by theoperation lof the safet-ydrum i toeifect a supply off current to theniotor.

9. In an elevator, the combination with a car, of a car brake, anelectric motor for op erating the brakeya safety circuit, andmeans forautomatically closing a circuit to said motor when the safety circuit isopened.

10. In an elevator, the combination with a car, of a brake, an electricmotor for operating the brake, a source of current supply,

and a otential switch, operable to automatically c ose a circuit to saidmotor when' the potential switch is opened.'

11. In an elevator, the combination with a car, of an electric hoistingmotor, a car brake,-an electric motor for operating said brake, a sourceof current supply, and an' electro-magnetic potential switch controllingthe supply of current `to said motors and permitting current to only onemotor at a time.

12. In an elevator, the combination with a car, o' an electric hoistingmotor, a car brake, an electric motor for operating said brake, and anelectro-ma netic potential switch controlling the supp y of current tothe motors by opening the circuit of the brake magnet motor when enerized and opening the circuit of the hoisting motor when denergized. 13.In an elevator, the combination with an elevator car, of a brake membercarried by the car, a cooperating stationary brake member, a rotaryelectric motor on the car, brake operat-inlr mechanisml'connected to themotor and brake, and a hand, wheel connected to said mechanism.

l 14. n an evatol" h@ combination v 24J 1mm@ im this snecilcaton in thereseno'e of c l 9 v u n n 1 nu A' n car, of gulde falls, gapping jawsifm said two subscmbmg vilt-messes.

ui e rfis meha ism for 0 efart 0" Said X g d C F- f P* n@ f. AXELMAGNUSON. 25a-WS, a, rotaj] @lemme mcftm geared to sind l mechanism, anda hand Wheel gead i@ h@ iefsses' shaftg ofsad motor, Y Vf; KINNEAR,

In testlmony whereof, l have slgned my JNO. WOHNSIEDLER.

@apes ci isms patent may "DE oaoained for fr@ cents weh, by amb-sesam@the Gcmm'lssione ai Patents,

Washington, 'El 2."

